This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 97 |
| 3 | 971 |
| 4 | 9719 |
| 5 | 97973 |
| 6 | 979717 |
| 7 | 9797371 |
| 8 | 97973731 |
| 9 | 979797979 |
| 10 | 9797979713 |
| 11 | 97979797171 |
| 12 | 979797973117 |
| 13 | 9797979797971 |
| 14 | 97979797973173 |
| 15 | 979797979797317 |
| 16 | 9797979797979719 |
| 17 | 97979797979797373 |
| 18 | 979797979797971179 |
| 19 | 9797979797979737971 |